For years, there have been documented cases of UFO sightings around theworld - Buenos Aires, Seoul, France, Germany, China. But in 2011, whatwere once just sightings becomes a terrifying reality when Earth isattacked by unknown forces. As people everywhere watch as the world'sgreat cities fall, there remains one place that becomes the last standfor mankind in a battle no one expected. It's up to your team to draw aline in the sand and take on an enemy unlike any ever encounteredbefore